Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

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303 results

Atmospheric turbidity

energy

The reduction in the transparency of air resulting both from the scattering of light by tiny particles suspended in the air (water droplets, ice crystallites, and dust and smoke particles) and from the absorption of light by water vapor.

Atom

energy

An atom is the smallest unit of ordinary matter that forms a chemical element.

Atomic age

energy

The Atomic Age, also known as the Atomic Era, is the period of history following the detonation of the first nuclear weapon.

Atomic battery

energy

An atomic battery, nuclear battery, radioisotope battery or radioisotope generator is a device which uses energy from the decay of a radioactive isotope to generate electricity.

Atomic mass number

energy

The atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.

Atomic nucleus

energy

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom.

Atomization

marine

Subdivision of a material into its smallest particles, such as fuels reduced to a fine spray mist by diesel engine injectors.

Atomizer

marine

A nozzle arrangement through which fuel oil is forced under pressure in order to leave as a fine spray i.e. atomized.

Atriums

marine

Atriums are public spaces within a single main vertical zone spanning three or more open decks, (SOLAS).

Attenuation

energy

In electrical engineering and telecommunications, attenuation affects the propagation of waves and signals in electrical circuits, in optical fibers, and in air. Electrical attenuators and optical attenuators are commonly manufactured components in this field.

Austenite

marine

One of three possible phases of iron and carbon atoms in carbon steel, characterised by a face-centred cubit unit. See also Ferrite and Cementite.

Auto container

marine

Container equipped for the transportation of vehicles.

Autogas

energy

Autogas is the common name for liquefied petroleum gas (LPG) when it is used as a fuel in internal combustion engines in vehicles as well as in stationary applications such as generators.

Auto-ignition

marine

The ignition of a combustible material without initiation by a spark or flame, when the material has been raised to a temperature at which self-sustaining combustion occurs.

Automatic fire suppression systems

energy

Fire protection water spray systems are used to cool a transformer to prevent damage if exposed to radiation heat transfer from a fire involving oil released from another transformer that has failed.

Automatic generation control

energy

In an electric power system, automatic generation control is a system for adjusting the power output of multiple generators at different power plants, in response to changes in the load.

Automatic Identification System (AIS)

marine

A novel radar-based system displaying ship’s unique identification numbers alongside the radar vectors. AIS equipment consists of a central unit that collates information from the ship’s navigation systems...

Automatic pilot, autopilot

marine

Automatic control system used for automatic navigation. The system can sense the difference between the ordered course of the ship and the actual course and will cause the rudder to move to an angle proportional to this error.

Automatic radar plotting aids (ARPA)

marine

Automatic radar plotting aids are essentially utilized to improve the standard of collision avoidance at sea. Primarily designed as anti-collision radar, the ARPA technology removed the chore of plotting targets...

Automatic re-close function

energy

Transmission and distribution systems use an automatic re-close function which is commonly used on overhead lines to attempt to restore power in the event of a transient fault.

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